WHAT REALLY TURNS PEOPLE ON? Men and women haven't been honest—with themselves or each other. What they say they like is often quite different from what they look for when nobody is watching. But how can we learn the truth?

Two bold young neuroscientists have initiated a revolution in the scientific study of sexual attraction. Before Ogi Ogas and Sai Gaddam, the only researcher to systematically investigate sexual desires was Alfred Kinsey, who surveyed 18,000 middle-class Caucasians in the 1950s. But Ogas and Gaddam have studied the secret sexual behavior of more than a hundred million men and women around the world. Their method? They observed what people do within the anonymity of the Internet.

Ogas and Gaddam analyzed a billion web searches, a million Web sites, a million erotic videos, a million erotic stories, millions of personal ads, and tens of thousands of digitized romance novels. Their groundbreaking findings will profoundly alter the way you think about the sexual relationships of women and men.

By combining online behavioral data with cutting edge neuroscience, Ogas and Gaddam have uncovered startling truths. Men prefer overweight women to underweight women. Women enjoy reading about two heterosexual men having sex. Men often seek erotic videos featuring women in their 50s and 60s. Other than preferring males, gay men have almost identical sexual desires as straight men.

For the very first time, Ogas and Gaddam reveal profound differences between the sexual brains of men and women. Just like the hard-wired taste cues on your tongue--sweet, sour, salty, savory, and bitter--humans have hard-wired sexual cues. But though men and women share the same taste cues, their sexual cues are very different. And they work differently: a single cue triggers arousal in the male brain, but women’s brains require multiple cues to become aroused. Men’s brains form their sexual interests during adolescence and rarely change, while women’s sexual interests are dynamic and change frequently throughout their lives. In men, physical arousal and psychological arousal are united, while in women, psychological arousal is separated from physical arousal.

Is your partner telling you what really turns him on? Is your partner faking her pleasure? And just how unusual are your own desires? A Billion Wicked Thoughts will forever change the way you think about your sexual relationships.